<template>
  <div>
    <el-switch v-model="draggable" active-text="开启拖拽" inactive-text="关闭拖拽"></el-switch>
    <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>
    <el-tree
      :data="menus"
      :props="defaultProps"
      :expand-on-click-node="false"
      show-checkbox
      node-key="catId"
      :default-expanded-keys="expandedKey"
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      ref="menuTree"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button
            v-if="node.level <=2"
            type="text"
            size="mini"
            @click="() => append(data)"
          >Append</el-button>
          <el-button type="text" size="mini" @click="edit(data)">edit</el-button>
          <el-button
            v-if="node.childNodes.length==0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >Delete</el-button>
        </span>
      </span>
    </el-tree>

    <el-dialog
      :title="title"
      :visible.sync="dialogVisible"
      width="30%"
      :close-on-click-modal="false"
    >
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input v-model="category.productUnit" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  //这里可以导入其他文件（比如：组件，工具js，第三方插件js，json文件，图片文件等等）
  //例如：import 《组件名称》 from '《组件路径》';

  export default {
    //import引入的组件需要注入到对象中才能使用
    components: {},
    props: {},
    data() {
      return {
        pCid: [],
        draggable: false,
        updateNodes: [],
        maxLevel: 0,
        title: "",
        dialogType: "", //edit,add
        category: {
          name: "",
          parentCid: 0,
          catLevel: 0,
          showStatus: 1,
          sort: 0,
          productUnit: "",
          icon: "",
          catId: null
        },
        dialogVisible: false,
        menus: [],
        expandedKey: [],
        defaultProps: {
          children: "children",
          label: "name"
        }
      };
    },

    //计算属性 类似于data概念
    computed: {},
    //监控data中的数据变化
    watch: {},
    //方法集合
    methods: {
      getMenus() {
        this.$http({
          url: this.$http.adornUrl("/product/category/list/tree"),
          method: "get"
        }).then(({data}) => {
          this.menus = data.data;
        });
      },
      batchDelete() {
        let catIds = [];
        let checkedNodes = this.$refs.menuTree.getCheckedNodes();
        for (let i = 0; i < checkedNodes.length; i++) {
          catIds.push(checkedNodes[i].catId);
        }
        this.$confirm(`是否批量删除【${catIds}】菜单?`, "提示", {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        })
          .then(() => {
            this.$http({
              url: this.$http.adornUrl("/product/category/delete"),
              method: "post",
              data: this.$http.adornData(catIds, false)
            }).then(({data}) => {
              this.$message({
                message: "菜单批量删除成功",
                type: "success"
              });
              this.getMenus();
            });
          })
          .catch(() => {
          });
      },
      batchSave() {
        this.$http({
          url: this.$http.adornUrl("/product/category/update/sort"),
          method: "post",
          data: this.$http.adornData(this.updateNodes, false)
        }).then(({data}) => {
          this.$message({
            message: "菜单顺序等修改成功",
            type: "success"
          });
          //刷新出新的菜单
          this.getMenus();
          //设置需要默认展开的菜单
          this.expandedKey = this.pCid;
          this.updateNodes = [];
          this.maxLevel = 0;
          // this.pCid = 0;
        });
      },
      handleDrop(draggingNode, dropNode, dropType, ev) {
        //1、当前节点最新的父节点id
        let pCid = 0;
        let siblings = null;
        if (dropType == "before" || dropType == "after") {
          pCid =
            dropNode.parent.data.catId == undefined
              ? 0
              : dropNode.parent.data.catId;
          siblings = dropNode.parent.childNodes;
        } else {
          pCid = dropNode.data.catId;
          siblings = dropNode.childNodes;
        }
        this.pCid.push(pCid);

        //2、当前拖拽节点的最新顺序，
        for (let i = 0; i < siblings.length; i++) {
          if (siblings[i].data.catId == draggingNode.data.catId) {
            //如果遍历的是当前正在拖拽的节点
            let catLevel = draggingNode.level;
            if (siblings[i].level != draggingNode.level) {
              //当前节点的层级发生变化
              catLevel = siblings[i].level;
              //修改他子节点的层级
              this.updateChildNodeLevel(siblings[i]);
            }
            this.updateNodes.push({
              catId: siblings[i].data.catId,
              sort: i,
              parentCid: pCid,
              catLevel: catLevel
            });
          } else {
            this.updateNodes.push({catId: siblings[i].data.catId, sort: i});
          }
        }

        //3、当前拖拽节点的最新层级
      },
      updateChildNodeLevel(node) {
        if (node.childNodes.length > 0) {
          for (let i = 0; i < node.childNodes.length; i++) {
            var cNode = node.childNodes[i].data;
            this.updateNodes.push({
              catId: cNode.catId,
              catLevel: node.childNodes[i].level
            });
            this.updateChildNodeLevel(node.childNodes[i]);
          }
        }
      },
      allowDrop(draggingNode, dropNode, type) {
        //1、被拖动的当前节点以及所在的父节点总层数不能大于3

        //1）、被拖动的当前节点总层数
        //
        this.countNodeLevel(draggingNode);
        //当前正在拖动的节点+父节点所在的深度不大于3即可
        let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;

        //   this.maxLevel
        if (type == "inner") {
          // console.log(
          //   `this.maxLevel：${this.maxLevel}；draggingNode.data.catLevel：${draggingNode.data.catLevel}；dropNode.level：${dropNode.level}`
          // );
          return deep + dropNode.level <= 3;
        } else {
          return deep + dropNode.parent.level <= 3;
        }
      },
      countNodeLevel(node) {
        //找到所有子节点，求出最大深度
        if (node.childNodes != null && node.childNodes.length > 0) {
          for (let i = 0; i < node.childNodes.length; i++) {
            if (node.childNodes[i].level > this.maxLevel) {
              this.maxLevel = node.childNodes[i].level;
            }
            this.countNodeLevel(node.childNodes[i]);
          }
        }
      },
      edit(data) {
        this.dialogType = "edit";
        this.title = "修改分类";
        this.dialogVisible = true;

        //发送请求获取当前节点最新的数据
        this.$http({
          url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
          method: "get"
        }).then(({data}) => {
          //请求成功
          this.category.name = data.data.name;
          this.category.catId = data.data.catId;
          this.category.icon = data.data.icon;
          this.category.productUnit = data.data.productUnit;
          this.category.parentCid = data.data.parentCid;
          this.category.catLevel = data.data.catLevel;
          this.category.sort = data.data.sort;
          this.category.showStatus = data.data.showStatus;
          /**
           *         parentCid: 0,
           catLevel: 0,
           showStatus: 1,
           sort: 0,
           */
        });
      },
      append(data) {
        this.dialogType = "add";
        this.title = "添加分类";
        this.dialogVisible = true;
        this.category.parentCid = data.catId;
        this.category.catLevel = data.catLevel * 1 + 1;
        this.category.catId = null;
        this.category.name = "";
        this.category.icon = "";
        this.category.productUnit = "";
        this.category.sort = 0;
        this.category.showStatus = 1;
      },

      submitData() {
        if (this.dialogType == "add") {
          this.addCategory();
        }
        if (this.dialogType == "edit") {
          this.editCategory();
        }
      },
      //修改三级分类数据
      editCategory() {
        var {catId, name, icon, productUnit} = this.category;
        this.$http({
          url: this.$http.adornUrl("/product/category/update"),
          method: "post",
          data: this.$http.adornData({catId, name, icon, productUnit}, false)
        }).then(({data}) => {
          this.$message({
            message: "菜单修改成功",
            type: "success"
          });
          //关闭对话框
          this.dialogVisible = false;
          //刷新出新的菜单
          this.getMenus();
          //设置需要默认展开的菜单
          this.expandedKey = [this.category.parentCid];
        });
      },
      //添加三级分类
      addCategory() {
        this.$http({
          url: this.$http.adornUrl("/product/category/save"),
          method: "post",
          data: this.$http.adornData(this.category, false)
        }).then(({data}) => {
          this.$message({
            message: "菜单保存成功",
            type: "success"
          });
          //关闭对话框
          this.dialogVisible = false;
          //刷新出新的菜单
          this.getMenus();
          //设置需要默认展开的菜单
          this.expandedKey = [this.category.parentCid];
        });
      },

      remove(node, data) {
        var ids = [data.catId];
        this.$confirm(`是否删除【${data.name}】菜单?`, "提示", {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        })
          .then(() => {
            this.$http({
              url: this.$http.adornUrl("/product/category/delete"),
              method: "post",
              data: this.$http.adornData(ids, false)
            }).then(({data}) => {
              this.$message({
                message: "菜单删除成功",
                type: "success"
              });
              //刷新出新的菜单
              this.getMenus();
              //设置需要默认展开的菜单
              this.expandedKey = [node.parent.data.catId];
            });
          })
          .catch(() => {
          });

      }
    },
    //生命周期 - 创建完成（可以访问当前this实例）
    created() {
      this.getMenus();
    },
    //生命周期 - 挂载完成（可以访问DOM元素）
    mounted() {
    },
    beforeCreate() {
    }, //生命周期 - 创建之前
    beforeMount() {
    }, //生命周期 - 挂载之前
    beforeUpdate() {
    }, //生命周期 - 更新之前
    updated() {
    }, //生命周期 - 更新之后
    beforeDestroy() {
    }, //生命周期 - 销毁之前
    destroyed() {
    }, //生命周期 - 销毁完成
    activated() {
    } //如果页面有keep-alive缓存功能，这个函数会触发
  };
</script>
<style scoped>
</

style

>
